I'm in love with one of my best friend's sister.

Ask best friend first. Are you really this autistic?

>>17232940
Just talk to your best friend what's the big deal man.

Don't say shit, who you or his sister fuck are none of his business.

Tell him after the fact, if it works out.

>>17233006
>Hey I fucked your sister and never told you about it even though we've been best friends for over a decade
See how that sounds?

Just talk to your friend first. Even if things don't work out between you and his sister, at least you did your part to preserve the integrity of your relationship with your best friend.

>>17232940
It could work out. You could end up with her and your friend will be all like "you're a great guy. My sister couldn't be with anyone better"

Or he could get all butthurt and act like she's not supposed to date anyone, ever. How old are all three of you?

If you HAD to choose, friends with both or banging the sister, which would it be?

>>17232940
How old are the two of you

>>17232940

The fuck? You're clearly not beat friends if he doesn't find you "worthy" of his sister or whatever. Just fuck her and if he gets Betamad just find new friends, there are more than a billion people on the planet

>>17233163
Sure when you put it like a fucking retard anything can sound bad.

>>Hey dude, I wanna fuck your sister, but I keep thinking of you and I can't.

See what I mean?

OP you're putting the horse before the cart here. Worry about fucking her first, tell him after. You don't need permission from him. Just a "hey man, your sister and I are going out." Will do fine.